Light & Matter Kate albarracin Reflection & Reflection & Light

Reflection Refraction Light bounces off of objects Light bends in objects

Sorting Reflection Refraction Mirror Shiny Screen Key Eyeglasses Prism Rainbow Magnifying glass Pond Water straight

Light travels VERY FAST – about 300,000 kilometers per second or 186,000 miles per second. At this speed light could travel the equivalent of 8 times around the world in one second!

Light travels in _______ lines: Properties of Light Light travels in _______ lines: Straight Laser

Light hitting at an angle is bent Light hitting straight on is not bent

Refraction A medium is something that light travels through! Light rays are slowed down by the water The amount that light bends when it enters a new medium is called the “index of refraction” Refraction is when light speeds up or slows down due to travelling in a different medium Causes the ruler to look bent at the surface The mediums in this example are water and air

Straw Demo

Regular vs. Diffuse Reflection Smooth, shiny surfaces have a regular reflection: Rough, dull surfaces have a diffuse reflection. Diffuse reflection is when light is scattered in different directions

Part 2 - Reflection and Mirrors Reflection from a mirror: Normal Incident ray Reflected ray Angle of incidence Angle of reflection Mirror

Angle of incidence = Angle of reflection The Law of Reflection Angle of incidence = Angle of reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!

We see things because they reflect light into our eyes We see things because they reflect light into our eyes! This is literally the only way we get to see things! ALL objects we see either create light or reflect light!! Homework